Liverpool and Arsenal did the unthinkable in the Premier League title race on Sunday. A lot is made of playing first when you are battling at the top for English football’s major honour and it proved to be the case for Liverpool and Arsenal’s frustration and disappointment. Manchester City thrashed Luton Town on Saturday by putting five past the relegation-threatened team, with Jeremy Doku sending a message to the Reds. But Jurgen Klopp then watched his team suffer a shock 1-0 defeat to Crystal Palace and then witnessed, hours later, Arsenal shoot themselves in the foot by losing to Aston Vill…